[Bugs] [Bug 1513920] New: call_stack_t->groups nullity can crash bricks

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1513920

            Bug ID: 1513920
           Summary: call_stack_t->groups nullity can crash bricks
           Product: GlusterFS
           Version: mainline
         Component: protocol
          Assignee: bugs at gluster.org
          Reporter: csaba at redhat.com
                CC: bugs at gluster.org



Description of problem:

In certain code paths gid_resolve() can leave the group list in the call stack
zero. If some server side function does then a copy_frame() it will cause a
crash.

Note: current standard server configurations do not expose this issue, but the
crash occurs with certain out of tree xlators loaded on a brick.

Steps to Reproduce:

1. Compile the sdfs ("server dentry fop serializer") translator that's
currently availabe on the experimental branch
(https://review.gluster.org/18082) and add it to the brick configuration.
2. run the test case tests/bug/nfs/bug-1053579.t

Actual results:

Crash.

Expected results:

Test case succeeds.

Additional info:

The issue was brought to attention and discussed in the following experimental
branch hotfix: https://review.gluster.org/18151

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